- Dance Companies, Merrillville
- Data Processing Services, Merrillville
- Day Spas, Merrillville
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Merrillville
- Decorating & Designing Services, Merrillville
- Delicatessen Restaurants, Merrillville
- Delivery & Errand Services, Merrillville
- Dental Bonding & Cosmetic Dentistry, Merrillville - Cosmetic Dentist & Tooth Bonding
- Dental Consultants, Merrillville
- Dental Information & Referral Service, Merrillville - Educational, Referral & Support Service Centers
- Dental Supplies & Equipment, Merrillville
- Dentists, Merrillville
- Dentures, Merrillville
- Department Stores, Merrillville
- Dermatologists, Merrillville - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Children Services, Merrillville
- Developmental Disabilities, Merrillville
- Diagnostic Equipment Medical, Merrillville
- Dialysis Clinics, Merrillville - Kidney Dialysis Centers
- Diamonds & Precious & Semi-Precious Stones, Merrillville
- Die Casting, Merrillville
- Digital Printing & Imaging Service, Merrillville
- Direct Mail Advertising Services, Merrillville
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- Disability And Social Security Attorneys & Lawyers, Merrillville
- Disciples Of Christ Church, Merrillville
- Discount Stores, Merrillville - Clothing, Grocery, Furniture, Etc
- Disney Store, Merrillville
- Dispensing Machines, Merrillville
- Divorce & Family Law Attorneys & Lawyers, Merrillville
- Doctorate Degree, Merrillville
- Doctors, Physicians & Surgeons, Merrillville
- Donuts, Merrillville
- Door & Gate Operating Devices, Merrillville
- Doors & Door Frames, Merrillville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Services, Merrillville
- Drinking Establishments, Merrillville
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Merrillville
- Dry Cleaning & Laundry, Merrillville - Dry Cleaners
- Drywall Contractors, Merrillville - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Merrillville
- Drywall, Insulation & Plaster Contractors, Merrillville - Installation & Repair Services
- DUI Attorneys & Lawyers, Merrillville - DWI - Drunk Driving
- DUI Attorneys & Lawyers, Merrillville - DWI - Drunk Driving
- DUI Lawyers & Attorneys, Merrillville - DWI - Drunk Driving
- Dumpster Rental, Merrillville
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